Lifting-jack.



A. J. CROSS LIPTING JACK. APPLICATION FILED MAR. 28, 1912.

1 ,050, 1 0?. Emma Jan. 14, 1913.

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7 I @zwcsym yg ARTHUR J. CROSS, 0F IBOSTON, MASSACHUSETTS.

LIFTING-JACK.

Specification of Letters Patent.

Patented Jan. 14, 1913.

Application filed March 28, 1912. Serial No. 683,718;

To all whom it may concern: I

Be it known that I, ARTHUR J. Cnoss, a subject of King George V,residing at Boston, in the county of Suffolk and State of Massachusetts,have invented new and useful Improvements in Lifting-Jacks, of which thefollowing is a specification.

This invention relates to improvements in lifting acks and has for itsobject to provide a powerful, easily operable device particularlyadapted for use in jacking automobiles, wagons and the like, and whichis capable of being quickly adjusted to conform to high or low devicesto lift the same with equal ease, and with little or no variation in thepower required to manipulate the jack in either said high or lowpositions.

Another object of thefinvention is to provide a device having meanscapable of automatically locking the same in its Various positions or,quickly unlocking the same to permit lowering thereof.

The invention consists in the combination and arrangement of parts setforth in the following specification and particularly pointed out in theclaims.

Referring to the drawings: Figure 1 is a plan view of a device embodyingmy invention. Fig. 2 is a side elevation of the same.

Fig. 3 is a sectional elevation taken on line 3, 3 of Fig. 1 with partsbroken away to save space in the drawings; Fig. 4 1s a detail view of amodified form of rest, the same being connected directly to the lowerend of.

the carrier for said jack. Fig. 5' is a detail view showing amodification in the arrangement of the'means for retaining the carrierand standard in parallel relation to each other, and means for movingsaid carrier relatively to said standard.

Like numerals refer to like parts throughout the several views of thedrawings. In the drawings, 6 is a base provided with wheels 7 rotatablymounted upon the base 6, said wheels and said base constituting a truckupon which is mounted a standard 8 in an upright position, said standardbeing preferably rectangular in cross section.

A carrler 9 is arranged to be moved upwardly and downwardly relativelyto said standard and connected therewith by means hereinafterspecifically described. The carrier 9 is provided, at its upper end,with a rest 10 which is of any suitable construction adapted to engage apart of the vehicle or other device to be lifted, and has a stem 11pivotally connected therewith which is adapted to telescope the carrier9 forthe' purpose of varying the position of the rest 10 relatively tosaid carrier, and to support said rest in its various positionsrelatively" foriinstance, as a spring 16 interposed. be-f of said pawland said tween the outer ends carrier.

The carrier 9. is preferably vertically disposed andnadapted to be movedupwardly and downwardly and to be retained in its vertical position,which is also ,substan-."

tially parallel with the-longitudinal median line of the standard 8 by alurality of pairs of links 17 and 18 parallelly arranged and pivoted at19 and 20 to said carrier 9. The

opposite ends of said links arepi-voted at 21 and 22, preferably upon aslide 23 which is provided with a hole 2A adapted to receive thestandard 8 and to permit a relative movement between said slide and saidstandard longitudinally thereof for the purpose of varying the height ofsaid pivots 21 and 22 relatively to the base 6. To maintain said slide23 at any predetermined point on said standard a pawl 25 is providedwhich is pivoted' upon the pin 26 in the lower end of said slide andengages teeth 27, which are formed on' the adjacent face of the standard8. A handle or weight 28 extends laterallyof said pawl outwardly fromsaid standard for the purpose of releasing said pawl when it is desiredto lower the slide, and furthermore constitutes a weight to retain theend of said pawl 25 in its engagement wit-h teeth 27. It will also beseen that said pawl is mounted within a slot 29 which terminatesslightly above the upper end of said pawl thereby providing a stopagainst which the handle 28 will abut when it is desired to raise saidslide by means thereof. Thelowermost pair of links 17 are preferablyarranged upon opposite sides of the slide 23 'and are provided withextensions 30, which extend rearwardly from the pivot 22 and upon theoppositeside thereof from said Preferably between said extensions.

linksll'. is fastened a handle 31 by suitable means,

should move the the floor line, and furthermore by bending such as thescrews'32, said handle and said .links constituting a bifurcated liftinglever which when rocked upon its pivot 22 upwardly and downwardly isadaptedto raise or lower the carrier 9, thus raising or lowering thevehicle or other means beneath which the rest 10 is placed.

With the arrangement of the lifting lever and links as just described,the pivot 22 has to support the entire weight of the vehicle to etherwith the pressure applied to the li ing lever grip 34: during thelifting operation thereof. To more evenly distribute the weight, andconsequently the wear upon said jack the upper pair of links 18 may beextended beyond the pivot 21 and votally connected at 18 to links 18whic are in turn pivoted at 18 to said lifting lever, as shown in Fig. 5and when so constructed said up r links constitute levers. Said lever isent upwardly at 33 sufiiciently to allow the outer end 34: whichconstitutes the grip of the handle 31 to remain slightly above the floorline when the point 33 is in contact therewith at which time the carrier9 will be elevated. This feature prevents injury to the hand of theoperator in case he same too rapidly toward said lever at said point 33a knee is formed which engages the surface upon which the base of saidjack rests or a block placed beneath said knee as a supporttherefor andconstitutes a fulcrum, whereby when said handle 31 is depressed theslide 23 together with the instrumentalities carried thereby will beelevated or moved upwardly upon the standard 8, also by bending saidlever, a much shorter standard is permitted to be used, or in otherwords a much'wider range ofblmovement for the handle 31 will be pos s1e.

For the purpose of locking the carrier 9 or supporting it in its variouspositions relatively to the standard 8, I have provided a pawl 35 whichis mounted upon the pivot 20 at the lower end of said carrier andengages teeth 36, which are preferably arranged upon the slide 23substantially concentric with the axis of the pivot 22. The pawl 35 isnormally held in engagement with the teeth 36' by a spring 37 whichencircles vthe rod'38 engaging the pin 39 thereon at one of its ends andthe lug 40 on the lever 31 at its opposite end, said rod pivotallyconnected to the pawl 35 at 41.

A finger-piece 42 pivoted at 43 adjacent to the grip 34 of said handleis connected with the opposite end of the rod 38 a'nd'uponv movement ofsaid finger-piece toward said grip, the pawl 35 will be rocked upon itspivot 20 and thereby disen aged from said teeth 36, thus permittin a reeupward and downward movement 0 the carrier 9, while said pawl is held insuch aposition.

It its often necessary to get a purchase upon a device at a point muchlower than would be permissible with the rest 10 at its lowermostposition relatively to the carrier 9 and also relatively to the standard8, and to accomplish this result I have provided a second rest 44 whichpreferably constitutes a part of the bifurcated lifting levers and at apoint adjacent to the lower end of the support 9. This rest is capableof being moved upwardly and downwardly by the movement of the lever 31and of being locked in its various positions relatively to the slide 23by the pawl 35 in the same manner in which the carrier 9 is locked. Ashas previously been stated the rest L4 is on the bifurcated liftinglever, but in Fig. 4: I have shown a modified form in which said rest ismounted or formed upon the carrier 9 at the lower end thereof.

The general operation of the device hereinbefore specifically describedis as follows: The grip 34 is grasped by the operator, who

by means of'his finger against the finger- 3 piece 42 disengages thepawl 35 from the teeth 36 and permits the carrier 9 to be moveddownwardly by the upward movement of the grip end of the lever handle31, and if the device is beneath the vehicle to be jacked and the rest10 is at the right position to engage said vehicle, the grip end of thehandle 31 is moved downwardly about the pivot 22 which causes theopposite end of the lifting lever to rise thereby moving said restupwardly. The fingerpiece 42 is released and the pawl 35 moves intoengagement with the teeth 36 thereby supporting said carrier and rest inthe position desired. Ifit should so happen that the member of thedevice to be jacked is too low to permit the rest 10 to be placedtherebeneath, the slide 23 carrying said rest may be moved downwardly bythe rocking of the pawl 25 upon its pivot 26 to disengage the same fromthe teeth 27 or if this does not bring said rest low enough, the rest14: may be brought into use which may be adjusted upwardly or downwardlyby moving the slide 23 upwardly and downwardly upon the standard 8, andfurthermore by the rocking of the lifting lever upon its pivot 22.Should the device to be jacked be too high for the rest 10, said restand its stem 11 may be moved upwardly relatively to the carrier 9 untilthe. lowermost tooth of said stem has engaged the pawl 13 with the ad-'ditional adjust-ment hereinbefore stated of the movement of the slide 23relatively to the standard.

Havingthus described my invention what I claim and desire by LettersPatent to secure is:

1. A lifting jack, embodying in its construction, a base, a standardmounted thereon, a carrier having a rest at its upper end said carrieron said standar 1 positions relatively thereto.

and'one adjacent to its lower end, means to move said carrier upwardlyand downwardly relatively to said standard, com rising a plurality ofpairs of levers para elly and pivotally arranged upon said standard andpivotally connected at one side of the pivots thereof by said carrier,and at the opposite side with links disposed substantially arallel withthe longitudinal median line of said carrier, a handle fast to one pairof said levers, and means ada ted to support in its various 2. A liftingjack embodying in its construction, a base, a standard mounted thereonprovided with a plurality of teeth upon one of its faces, a slidemovable vertically on said standard having a plurality of teeth upon oneface thereof, a lever pivoted on said slide having a tooth formedthereon adapted to engage the teeth on said standard, a lifting leverpivoted upon said slide, a carrier pivot-ally connected to said lever, aplurality of rests carried by said lever, a pawl mounted upon the pivotconnectln said lifting lever with said carrier, an means on said liftinglever adapted to actuate said pawl to move the same into and out ofengagement with the teeth on said slide.

In testimony whereof I have hereunto set my hand in presence of twosubscribing witnesses.

ARTHUR J. CROSS Witnesses:

Cmumns S. Goonmc, SYDNEY E.. Tm.

Qopiu 01' this patent may be obtained for live cents each, by addressingthe "commissioner of latentl, Washington, D. 0.".

